Wood-refuse burner



J. P. WALSH.

WOOD REFUSE BURNER.y APPLICATION FILED Auc.1s, :9 19.

1,339,729. Patented May 11,1920.

JOSEPH' i?. WALSH, or'vANCoUvnR, BRITISH. COLUMBIA. CANADA.

. Woon-REFUSE summa.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed August 13`, 1919. Serial No. 317,292..

1 x all whom zt may concern Be it known that T, Josiirii P. VVALsH, Va j citizen ofthe United States, residing at Vancouver, in the Province of British Colum-l bia, Canada, have invented certain new and useful Improvements in Vood-Refuse Burners, of which the following is a specification. `This inventionv relates to vburner for the destruction of combustible refuse, such as that of lumber mills. It belongs toY that class known as aircooled wherein a grate surface onto which the refuse to be consumed is delivered an-d through which `a supply of air for combustion is indrawn by the natural draft of the fire, is surroundedby a selfsupporting frusto-conical casing, around the lower edge of which air is `freely admitted to" keep ythe casing wall' cool..

In furnaces of this class it has heretofore been considered necessary or desirable to provide an inner wall, retaining the fire within thelimit of the grate and deflecting upward the air admitted around the lower edge of the casing. l

This construction `is open to objection in that in strong wind fire is blown outaround the fewer edge of the casing, or the same may occur yby an occasional back fire. To these casualties objection istakenby the fire underwriters as they endanger the structure of the refusedelivery conveyer and adjacent Further. the fire underwriters require that the upper end of the burner smoke-stack be protected with a dome screen of 'relatively fine mesh to prevent escape of flying par ticles of 'light wood. This screen being.

clear 'of the fire. it is .found exceedingly difficult .to keep iclearof accumulation of p light, partially yconsumed wood` refuse, which is carried up b v the draft and adheres to the screen, completely clogging it in a short time and destroying the efficacy vof the burner.

board of underwriters.

effectively prevents the escape of flame or fire during a strong wind or a back fire.

Again, I supplement 'the customary screen at the top of the smoke-stack with. a conical screen of coarser mesh adjacent the base of the saine, or at the junction ofl the cylindrical smoke-stack to the frustoconical casing, and to prevent the excessive draft caused by a smoke-stack of sufiicient heightvto satisfy the. requirements of the fire underwriters, I provide a series of closable apertures at the base of the cylindrical smoke-stack between the two screens, by which the draft may ybe regulated.

The 4invention is .fully set forth in the following specification, reference beingi` made to the drawings by panied,lin which: c

Figure l is a partial elevation and vertical longitudinal section through the burner.

Fig. 2 is a partial plan of the base of the 1 Same.

Fig. 3 is an enlarged detail of the lower end of the inclosing casing or shell of the burner and its connection to the grate wall.

In these drawings 2 representsan eXter- 1L. are 'covered by grate -bars 5 'through' which air for combustion is supplied to the fire. The spaces (i bounded by the circular wall 2 and air duct walls 3 and il are filled in with earth' to approximatelythe level of the outer wall 2.

Resting o n and secured to the. wall 2 of tlv;` grate area as a foundation. with'the upper ends secured to a ring 11. a framel work of inwardly sloped angle iron uprights 7 is erected, which is braced at intervals by pipe rings 8.

()n this framework a casing or shell E) of thin sheet metal is secured. forming aV hollow conical frustuni from a short distance above the level of the' furnace grate to the upper ring l1. From this upper ring li a cylindrical' extension 12 is carried upward asv a smoke-stack to a height sufficient to satisfy the requirements of the insurance Around. the space betweenthe level of the grate surface and .the lower edge of the casing 9 a screen 13 `of stout Wire mesh is secured to retain the which it is accomout from the grate by a strong wind yor back re. 4

An upwardly projecting conical screen 14 is introduced approximately at the junction largely by the air admitted through the ducts 3 and 4, and the heat of its combustion induces the inflow of the air by which it 1s consumed. The screen l'prevents the ma-` lterial to be burnt falling beyond-the limit of the grate and the flame and light wood being blown beyond the range of the burner.

It also permits an inflow of air to cool the inner wall of the casing -9 and its framework.

. .In burners of this class where anoverdelivery of refuse may at any time cause, for a short time, an'excessivedelivery of smoke, when the fiame breaks through, the gases ignite and may form a dangerous blow back, the flame cannot escape through the screen 13.`

The screen 14 prevents the escape of the lighter portions of the refuse lifted from the fire by the draft and holds them in reasonable proximity to the flame ofthe re, where they are periodically consumed, the air rising up the inner'wall of the casing and heated during such 'ascent supplying the necessary oxygen for such combustion. 1

The screen l5 at the top of the smokestack affords an additional security against the escape of sparks which renders the burner ,extra vsafe in meeting the requirements ofthe fire underwriters.

As the smoke-stack 12 has to be'carried I' lto--an elevation to meet the requirements of frusto-conical casing suitably supported the fire underwriters and as that height may in some4 cases induce too strong a draft through the fire, that draft may'be checked when found necessary by opening the doors 17 of the/aperture 16.V 7

Havinr now particularly described my invention, l hereby declare that what I claim as new and desire to be protected in by Letters Patent, `is`:

1. A 'wood refuse burner, comprising the combinationwith a circular hearth to which the refuse to be burned is delivered, of a lthereabove, the lower edge of which casing is a short distance above the hearth, a smoke-stack extending upward vfrom the smaller end of the casing, a screen across the f smoke-stack adjacent its connection to the casing, and a` screened hood across the top of the smoke-stack.

2. A wood refuse burner, comprising the 'combination with a circular hearth to which theorefuse to be burned is delivered, of a frusto-conical casing suitably supported thereabove, the lower edge of which casing is a short distance above the hearth, a

smokestack extending upward from the smaller end of -the casing, said stack pro- -vided with apertures intermediateof its length, damperslfor closing said apertures,

a screen across the smoke-stack adjacent'its connection to the casing, and a screen across the upper endof the same.

- 3. A wood refuse burner, comprising the combination with a circular hearth to which the'refuseto bel destroyed is delivered, a frustoconical casingsuitably supported to inclose the fire on the hearth, the lower edge of said casing being a vshort distance above 'the level of the hearth, a screen extending between 'the hearth level and the lower edge of the casingto close the space between the hearth and the lower edge of the casing, a

substantially cylindrical smoke-stack extending upward rom the smaller end oi' the casing, said smpke-stack having openings adjacent the connection Ito the casing, dam,

the refuse to be burned is delivered, said` hearth'having air .delivery ducts and grate`- bars covering the inner endsl ofthe same, a frusto-conical casing suitably supported to inclose the re on the hearth, the. lower edge of said casing being above the level of the hearth, a screen between the level of the,

hearth and the lower edge of the casing to close the space between the hearth and the lower edge of the casing, a substantially cylindrical smoke-stack extending upward.

fromV the smaller end of the casing, said smokeLstack having apertures adjacent to its place of connection to the casing, damvpers for closing said apertures, a screen across the smoke-stack below the closable apertures, and a screen of the smoke-stack.

In testimony whereof I affix my signature.

across the upper end JOSEPH P, WALSH. 

